But according to Sharks team doctor, Ewoudt van der Linde, it’s not a “bad concussion” and Lambie’s condition has since improved.
“However, there is a Boksmart protocol we have to follow with such an injury and we’ll need to strictly monitor him according to those standards.
“Therefore a decision will only be made by Thursday at the earliest.”
Van der Linde said they may even decide to make a decision as late as Saturday morning, which could see them travel to Bloemfontein with 23 players.
Apart from Lambie’s injury, fullback Louis Ludik sustained a dead leg against the Force and would need to pass a fitness test on Thursday.
The clash at the Free State Stadium kicks off at 17:05 on Saturday.